Tick the column names you want to keep. Dropping columns, adding a row number and trimming header spaces all happen inside your browser.
No uploadNo sign-upColumn names auto-detected
Process your CSVRuns on your device
Drop a CSV here
or click to choose · Shift_JIS / UTF-8 detected
Load a CSV to see its columns.
How to use
Drop a CSV or paste the table.
Tick the columns you want to keep (switch the mode to drop them instead).
Press Run, check the preview, then download the CSV.
What this tool does not do
Column order is preserved as-is — this tool does not reorder. Use the online editor if you need to drag columns around. A CSV without a header row will lose its first line as the header.
FAQ
Can I reorder the columns?
Not here — the original order is kept. Use the online editor (linked below) to drag columns, then save.
What about a CSV without a header row?
The first line is treated as the header, so you lose one data row. Add a header first (the row-cleaning tool can help) or use the editor.
Can I export only the dropped columns?
Switch the mode to “drop the ticked columns” and run again — the output is then the other side of the split.
How many columns can it handle?
There is no column limit; it runs within your browser's memory and handles tables with hundreds of columns.
Is my data uploaded?
No. Reading, filtering and exporting all happen locally in the browser.